Labour has read its John Maynard Keynes. It unleashed the “animal spirits” of a possible economic bounceback at its first investment summit yesterday, with an upbeat Keir Starmer pledging to “improve Britain’s brand” and promising a land of opportunity for global investors — and some “heritage Yookay“ experience thrown in — cottage pie lunch, dinner in the crypt at St Pauls, and King Charles working his royal charm.